| Functional Backfill and Its Future in Mining Lang Liu1; 1XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Xi'an, China; PAPER: 422/Mining/Regular (Oral) SCHEDULED: 12:10/Sat. 26 Oct. 2019/Zeus (55/Mezz. F) ABSTRACT: Backfill technology is regarded as an important technological carrier to realize safe, green and efficient deep mining [1]. According to the coupled problems of high-stress, high-temperature and multitudinous-goaf, etc., in deep mines, as well as high-cost of backfill mining, an academic ideal of Functional Backfill (FB) was put forward. The proposed FB can not only realize the function of traditional backfill, but can also achieve the expanded functions, i.e., cold-loading, heat-saving, energy-storage, seepage-proofing, etc. Firstly, the concepts of Functional Backfill Materials (FBM) and Functional Backfill Technology (FBT) were scientifically defined, and the conceptual model of the FBM was established. Secondly, from the functional point of backfill materials, the evolution process of backfill technology can be divided into three stages, e.g., volumetric backfill, structural backfill and functional backfill. Finally, on the basis of backfill material functions, the functional backfill were classified as Cold Load /Storage-Functional Backfill (CLS-FB) [2-3], Heat Storage & Release-Functional Backfill (HSR-FB) and Cavity-building -Functional Backfill (CB-FB). Correspondingly, the concepts, functions and basal principles of the mentioned three functional backfill were presented in detail. The application and exploration of functional backfill materials & technologies will further improve the backfill technologies in mines, which have an important and far-reaching impact on the deep mine geothermal co-exploitation, underground goaf reuse and strategic energy reserves, etc. References: [1] H.J. Lu, C.C. Qi, Q.S. Chen, D.Q. Gan, Z.L. Xue, Y.J. Hu. J. Clean Prod. 188 (2018) 601-612. [2] M. Wang, L. Liu, X.Y. Zhang, L. Chen, S.Q. Wang, Y.H. Jia. Appl. Therm. Eng.150 (2019) 121-131. [3] L. Liu, Z.Y. Fang, C.C. Qi, B. Zhang, L.J. Guo, K.I.-I.L. Song. Powder Technol. 343(2019), 454-464. |
